Round Weights | McMaster-Carr

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Test Weights

Calibrate your scale with these test weights.

Test Weights with Calibration Certificate

These test weights come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Legal-for-Trade Test Weights

Use with legal-for-trade scales.

Legal-for-Trade Test Weights
with Calibration Certificate

To ensure accurate calibration of legal-for-trade scales, these test weights come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Test Weight Sets with Calibration Certificate

A certificate of calibration traceable to NIST states that these test weight sets have passed a test for accuracy.

Precision Test Weights with Calibration Certificate

Often used to calibrate precision scales, these highly accurate test weights come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Test Weight Sets

Keep a variety of test weights on hand to calibrate your scales.

Precision Test Weights

Our most accurate test weights, these are often used to calibrate precision scales.

Precision Test Weight Sets
with Calibration Certificate

These highly accurate test weight sets for calibrating precision scales come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Legal-for-Trade Test Weight
Sets with Calibration Certificate

Ensure reliable calibration of legal-for-trade scales—these test weight sets come with a certificate of calibration traceable to ASTM that states they’ve passed a test for accuracy.

Precision Test Weight Sets

Use these highly accurate test weight sets to calibrate precision scales.

Legal-for-Trade Test Weight Sets

Designed for legal-for-trade scales.

Hanging Test Weights

The top hook lets you attach these weights to hanging scales, and the bottom hook lets you connect multiple weights in a series.

Hanging Test Weights with Calibration Certificate

The included certificate of calibration traceable to NIST states that these test weights have passed a test for accuracy.

Legal-for-Trade Hanging Test
Weights with Calibration Certificate

To ensure reliable calibration of legal-for-trade scales, these test weights come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Legal-for-Trade Hanging Test Weights

Designed to calibrate legal-for-trade scales.

Interlocking Test Weights

Stack multiple grooved weights together to calibrate your scales.

Interlocking Test Weights with Calibration Certificate

These test weights come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.